Quote:
Originally Posted by mrtiffin
I have oil coolers in the radiator. I did a pressure test about 2 months ago and most of the numbers were ok. I put rislone in the case and have yet to repeat the test. I think that plugging the system would be a bad idea considering I live in Houston, TX and drive about 30-35K miles alone in the city in each vehicle. 70 mph+ on average.
I don't think (for the amount of emulcified oil in the water) that the PO added any. I think the 25 yr.+ old radiator/oil cooler/ who knows what else, should probably be replaced. If others say plugging is not a bad option, then I might go ahead and do it.
btw, car is almost ready to finally turn over. More updates in another post.
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I went through some thing similar to what you are going through about 5 years ago. No oil in the coolant, but I had a bad radiator.
My car is an '85 S2, basically similar to your car. You want the good news or the bad news first? Well, here goes:
1. Bad news: The oil cooler and tranny coolers that are built into the black plastic side tanks of your radiator are probably leaking and they are NOT available anymore. If you search the web enough, I think you might find an article on one of the sites where some guy used gm coolers in his Porsche, but it took a lot of work. YES you need an oil cooler, and if you have an auto tranny, then YES you need a tranny cooler.
2. Good news: It is no trouble at all to get a decent used radiator without coolers from 928 International, and then mount a simple external air-to-oil cooler to the engine via a "sandwich" plate that sits between the block and oil filter. I think Devek still sells the actual plugs that fit in the block and block off where the old oil lines attached. I haven't looked in a while, but I suspect that 928 Motorsports sells a complete kit to do all this. Mount the cooler in your lower air intake, in front of the aux fan and run the hoses around the edge of the radiator.
I bought my oil cooler at Pep-boys, it is just a simple Hayden kit that is designed for V8 engines. Works just fine. If you plan to race, check the rules because the Hayden kit uses rubber hoses and clamps; this is verboten in many racing categories.
-If I were you, I wouldn't drive the car until you work this problem out. If you get the coolant to regular running temperature, it could reach as much as 13 psi. Since your oil is much higher pressure [3-5 bar], you won't have a problem with the coolant getting in the oil while the engine is running. But as soon as you shut the engine down, the oil pressure goes away.....
but not the pressure in the coolant! You have a breach in the system between the two fluids, and it is only a matter of time before coolant gets in your oil and that can wreck your day real quick!
N